QRC ACIA Interface Board

The QRC ACIA Interface Board is a 5 1/4" by 3 1/2"
double sided board for the SS-30 bus. It can be build for single
or dual ACIA in one slot. These boards were manufactured by Quality
Research Company of Spokane Washington in the early 1980s

This schematic shows a dual ACIA version with CTS and RTS.
The SWTPC 6800 SWTBUG ROM monitor will not work with a dual ACIA
in I/O slot number one. SWTBUG writes to location $8004 then reads
$8006. If the data is the same it is a MP-S (ACIA) interface.
If the data is different it must be a MP-C (PIA) interface. If
you need a dual ACIA in slot 1 you can modify SWTBUG or steal
the I/O select from an unused slot.

While most of the connections are made with PCB traces, the
output was unwired to allow for a vairity of configurations. Many
connections have the most common configuration as a trace between
two holes. For example, the rarely used DCD pin of the MC6850
is brought to the User Tie Point area and connected to ground.
To change the connection you just have to cut the trace and wire
it as needed.